CIEN: Financial results

Item 2.02 Results of Operations and Financial Condition. On June 4, 2026, Ciena Corporation ("Ciena") issued a press release announcing its financial results for its fiscal second quarter ended May 2, 2026. The text of the press release is furnished as Exhibit 99.1 to this Current Report on Form 8-K (this "Report"). As discussed in the press release, Ciena will be hosting an investor call to discuss its results of operations for its fiscal second quarter ended May 2, 2026. In conjunction with the issuance of this press release, Ciena posted to the quarterly results page of the "Investors" section of www.ciena.com an accompanying investor presentation. The investor presentation is furnished as Exhibit 99.2 to this Report. The information in Exhibits 99.1 and 99.2, as well as Item 2.02 of this Report, shall not be deemed “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended, or otherwise subject to the liabilities of that section, and shall not be incorporated by reference into any registration statement pursuant to the Securities Act of 1933, as amended. Investors are encouraged to review the “Investors” page of our website at www.ciena.com because, as with the other disclosure channels that we use, from time to time we may post material information exclusively on that site. Item 9.01 Financial Statements and Exhibits. Exhibit Number Description of Document 99.1 Text of Press Release dated June 4, 2026, issued by Ciena Corporation, reporting its results of operations for its fiscal second quarter ended May 2, 2026. 99.2 I nvestor Presentation for Ciena Corporation's fiscal second quarter ended May 2 , 2026. 104 Cover Page Interactive Data File (embedded within the Inline XBRL document). SIGNATURES Pursuant to the requirements of the Securi